Wrench



Mmm 23 wm. lg

J. :5. QUHSWAY WRENCH Filed OGb. 2Q 15323 W/TAESGES Ja, mes S. hrm/mg Patented Mar. 23, 1926.

UNITED STATES tenne JAMES S. CONWAY, OF ROCHESTER, MINNESOTA.-

WRENCH.

Application led October 20, 1923.

Be it known that Ldaains S, CoNwAY, a citizen ot the United States, residing at Rochester. in the county of Olmsted and State of Minnesota, have invented certain new and iiset'ul lmprovements in lVrenches, or" which the tolowing is a specifica-tion.

The present invention relates to a wrench and has for its principal object to provide a device ot this nature constructed sc that it may grasp diiierent sized objects within a considerable range.

Another important object ot the invention is to generally improve upon wrenches of this nature by providing a device possessed ot' a. simple and etlicient construction, one which is reliable, inexpensive tomanutacture7 durable,` compact, easily manipulated, and well adapted tor the purpose d esigned.

lith the above and numerous other objects in view which will appear as thedeseription progresses, the invention resides in certain novel features ot construction, and in the combination and arrangement of parts as will be hereinafter more tiilly described and claimed.

In the drawings:

Figure l is a side elevation of the wrench enibo-dying my invention; and

Figure 2 is'an edge elevation thereof.

Referring to the drawing in detail it will be seen that the shank A is formed in two bars l which extend in substantial parallelism with each other being offset intermediate their ends as at Q so that portions tliereot are spaced troni each other and the other portions thereof held together in a suitable handle 3. A fixed jaw 4 is disposed between the spaced portions of the bars l by means ot' rivet 5 or any other suitable device. This lifted jaw el is provided with an outer serrated curved engaging jaw t3. A pair of rods or links 7 are pivoted on a bolt 8 passing throiigli the spaced portions ot the bars l and the tired jaw a. A movable jaw 9 is tixcd to the ends of these links 7 as at l() and is provided with a curved serrated engaging tace ll on its inner side. Particular attention is called to the fact that the curved surface 6 of the fixed jaw is formed eccentric in relation to the pivot 8 of the links 7 thereby forming a cam surface from which 4it will be seen that when a member is dis- Serial No, 669,848.

posed between the jaws as illustrated in Figure l and the handle 3 moved to the right that said iaws G and 9 will tend to move toward each other thereby gripping the object Afirmly. Considering the device as shown in Figure l it will be seen that by moving. the movable jaw 9 to the lett the distance between the two aws may be varied and will become greater' as the jaw is moved in this direction and vice versa. It is evident that this wrench may be lused in the same manner as an ordinary Stilson wrench and will be much more etlicient since it will be self adjustable to the size ot the object within a reasonable range.

Although I have described my invention with a certain degree of particiilarity, it is to be understood that numerous changes in the details of construction and in the co1nbination-and arrangement of parts may be resorted to without departing from the spirit or scope ol' the invention as hereinafter claimed without sacrificing any of its advantages.

That is claimed is:

l. A wrench comprising a shank which includes a pair of spaced parallel bars, a

`longitudinally curved jaw arranged between 4the outer ends of the bars and extending at an oblique angle with respect thereto, aisecuring-pin passing through the bars and jaw intermediate the ends ot the latter, a pivot pin passing through' the bars and jaw adjacent its inner end, a pair o't links pivotally supported on the ends ot the pivot pin and a longitudinally curved aw rigidly held betweentlie links and being naoinfiblov in a plane parallel to the fixed jaw.

2, A wrench of the class described includ ing a handle, a pair ot rods extended into the handle and tired thereto,` portions ot the rods extending in. spaced re" ation to eacl; other from the handle, a jaw tixcd between the terminals of the spaced portions of the rods and provided with acurved serrated engaging tace, a pair ot links pivoted to the Vjaw at a point ott center in relation to tht` eiirve of the engaging siii-tace, and a jaw tixed between the terminals ot the links and provided with an inner serrated curved face for cooperation with the curved face of the tirst aw all in the manner and for the pui'- pose speeied..

yors

3. A Wrench comprising a pair of spaced jaw rigidly carried by and between the parallel bars, a handle carried by one end outer ends of the links7 Said jaw being movtliereof, a longil'udinally curved jaw rigidly able in a plane parallel to the first inenl0 supported by the ouler ends of the bars and tioned jaw.

5 extending at an oblique angle with respect In testimony whereof I affix my signature.

thereto, a pair of links pivoted to the inner end 0l' the jaw, and a longitudinally curved JAMES S. CONVAY. 

